Crankpins installed

I decided to use the quartering jig to hold onto the crankpins while the epoxy holding them in place cured. The theory was that regardless of where the actual holes in the wheels wound up, the vital metric was the distance between wheel centre and the crankpin itself. So, I gave the quartering jig bosses […]

Another way to wreck a driver

You may recall that one of the previous methods to wreck a driver was to drill the hole for the crankpin off-centre. Actually, that didn’t completely wreck the driver: once the spokes had been taken out, it looked salvageable. A short length of steel soldered in the hole and filed flush made it look as […]

Crankpin nuts: a war of attrition

The crankpins leverage M0.6 bolts, with nuts buried in housings inside the back of the wheel. Those nuts are really tiny – 1 mm across the flats, and so, I had always thought I would glue them into the back of the crankpins, rather than risk having them work loose and disappear amongst the ballast. […]

Just two holes!

All I wanted was two holes. Two holes for crankpins 1mm in diameter and the right distance from the centre holes in the quartering jig. It seemed simple enough when I conceived of them. But then, how to get the holes the right distance from the centre? So I made a tiny bushing to fit […]

Surprising failure in wheel experiment

Something has been bothering me. I spent a lot of effort to get the hole in the drivers concentric with the tyre, but then who knows what happens when the axle passes through that hole? Indeed, I’m fairly certain the axles are neither concentric nor perpendicular to the tyre. So, as I have to make […]

Quartering jig

I mostly completed the quartering jig before our vacation. It consists of two steel bars separated by aluminum spacers and with axle holders also made of aluminum. I’ve not yet drilled the crankpin holes, but a test fit of some axle material showed it was remarkably and satisfyingly accurate for a bodger like me.

Plan for quartering jig

While I have the excellent GW Models wheel press and used it on #10, it has two failings from my point of view. First, it assumes a press fit for the wheels; that’s one thing with a plastic centre, but another for steel centres and axles where the two parts need to be machined to […]

Bad crank pin holes

When you simultaneously wreck a part and break your last drill bit of that size, it’s a good time to take a little rest. Actually, I’ve now pretty much committed to mulligans on two out of four drivers, which will teach me not to celebrate finishing some parts until I’ve finished working with them. Despite […]

Crank pin holes

To line up the crank pin holes and get them the right distance from the axle, I have created a little jig out of 1/16 x 1/2 inch brass. Using relatively heavy material like this should keep wear to a minimum, at least long enough for two or three engines. The jig is pointed at […]

Crank pin proof of concept

The M0.6 screws and nuts arrived just before the Railway Modellers’ Meet, and now that most of the dust has settled, I’ve spent a part of a glorious spring morning trying out my idea for a crank pin. When the weather’s as nice as this, progress on the locomotive has to slow down. Vancouver winters […]